diff --git a/crates/ely_browser_core/src/state/commands.rs b/crates/ely_browser_core/src/state/commands.rs
index cfcf3c2..ab1bc8b 100644
--- a/crates/ely_browser_core/src/state/commands.rs
+++ b/crates/ely_browser_core/src/state/commands.rs
@@ -176,6 +176,17 @@ impl BrowserCore {
             "detach-split-pane" | "detach split pane" | "detach-pane" | "detach pane" => {
                 self.detach_active_split_pane()
             }
+            "swap-split-pane" | "swap split pane" | "swap-pane" | "swap pane" => {
+                self.swap_active_split_pane()
+            }
+            "swap-split-pane-left"
+            | "swap split pane left"
+            | "swap-pane-left"
+            | "swap pane left" => self.swap_active_split_pane_previous(),
+            "swap-split-pane-right"
+            | "swap split pane right"
+            | "swap-pane-right"
+            | "swap pane right" => self.swap_active_split_pane_next(),
             "duplicate-split-pane"
             | "duplicate split pane"
             | "duplicate-pane"
diff --git a/crates/ely_browser_core/src/state/splits.rs b/crates/ely_browser_core/src/state/splits.rs
index 2064c35..679e0cb 100644
--- a/crates/ely_browser_core/src/state/splits.rs
+++ b/crates/ely_browser_core/src/state/splits.rs
@@ -130,6 +130,20 @@ impl BrowserCore {
         Ok(Some(duplicated_tab_id))
     }
 
+    pub fn swap_active_split_pane(&mut self) -> Result<bool, CoreError> {
+        self.swap_active_split_pane_by(|layout, tab_id| {
+            layout.swap_tab_with_next(tab_id) || layout.swap_tab_with_previous(tab_id)
+        })
+    }
+
+    pub fn swap_active_split_pane_previous(&mut self) -> Result<bool, CoreError> {
+        self.swap_active_split_pane_by(SplitLayout::swap_tab_with_previous)
+    }
+
+    pub fn swap_active_split_pane_next(&mut self) -> Result<bool, CoreError> {
+        self.swap_active_split_pane_by(SplitLayout::swap_tab_with_next)
+    }
+
     pub fn split_active_tab_right(&mut self) -> Result<SplitId, CoreError> {
         let active_index = self.active_tab_index()?;
         let active_tab_id = self.tabs[active_index].id().clone();
@@ -156,6 +170,35 @@ impl BrowserCore {
         Ok(split_id)
     }
 
+    fn swap_active_split_pane_by(
+        &mut self,
+        swap_pane: impl FnOnce(&mut SplitLayout, &TabId) -> bool,
+    ) -> Result<bool, CoreError> {
+        let active_tab = self.active_tab()?;
+        let active_tab_id = active_tab.id().clone();
+        let Some(split_id) = active_tab.split_id().cloned() else {
+            return Ok(false);
+        };
+
+        let swapped = {
+            let layout = self
+                .split_layouts
+                .iter_mut()
+                .find(|layout| layout.id() == &split_id)
+                .ok_or_else(|| CoreError::SplitNotFound { id: split_id.clone() })?;
+            if !layout.contains_tab(&active_tab_id) {
+                return Err(CoreError::TabNotFound { id: active_tab_id });
+            }
+
+            swap_pane(layout, &active_tab_id)
+        };
+        if swapped {
+            self.refresh_saved_split_title(&split_id)?;
+        }
+
+        Ok(swapped)
+    }
+
     pub(super) fn detach_tab_from_split(&mut self, tab_id: &TabId) {
         for tab in self.tabs.iter_mut().filter(|tab| tab.id() == tab_id) {
             tab.clear_split_id();
diff --git a/crates/ely_browser_core/tests/split_swap.rs b/crates/ely_browser_core/tests/split_swap.rs
new file mode 100644
index 0000000..841a926
--- /dev/null
+++ b/crates/ely_browser_core/tests/split_swap.rs
@@ -0,0 +1,124 @@
+use std::error::Error;
+
+use ely_browser_core::{BrowserCore, InitialBrowserConfig};
+use ely_domain::{CommandIntent, SplitId, TabId, UrlText};
+
+#[test]
+fn swap_split_pane_command_swaps_last_pane_with_previous() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let (split_id, first_tab_id, second_tab_id, third_tab_id) = create_three_pane_split(&mut core)?;
+
+    core.set_command_query(">swap-split-pane");
+    let intent = core.submit_command()?;
+    let snapshot = core.snapshot()?;
+    let layout = snapshot
+        .split_layouts
+        .iter()
+        .find(|layout| layout.id() == &split_id)
+        .ok_or("missing split layout")?;
+    let pane_ids = layout.panes().iter().map(|pane| pane.tab_id()).collect::<Vec<_>>();
+
+    assert_eq!(intent, Some(CommandIntent::Command("swap-split-pane".to_string())));
+    assert_eq!(snapshot.active_tab_id, third_tab_id);
+    assert_eq!(pane_ids, vec![&first_tab_id, &third_tab_id, &second_tab_id]);
+    assert_eq!(snapshot.command_query, "");
+    Ok(())
+}
+
+#[test]
+fn swap_split_pane_right_command_moves_active_pane_forward() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let (split_id, first_tab_id, second_tab_id, third_tab_id) = create_three_pane_split(&mut core)?;
+    core.select_tab(&first_tab_id)?;
+
+    core.set_command_query(">swap-split-pane-right");
+    let intent = core.submit_command()?;
+    let snapshot = core.snapshot()?;
+    let layout = snapshot
+        .split_layouts
+        .iter()
+        .find(|layout| layout.id() == &split_id)
+        .ok_or("missing split layout")?;
+    let pane_ids = layout.panes().iter().map(|pane| pane.tab_id()).collect::<Vec<_>>();
+
+    assert_eq!(intent, Some(CommandIntent::Command("swap-split-pane-right".to_string())));
+    assert_eq!(snapshot.active_tab_id, first_tab_id);
+    assert_eq!(pane_ids, vec![&second_tab_id, &first_tab_id, &third_tab_id]);
+    assert_eq!(snapshot.command_query, "");
+    Ok(())
+}
+
+#[test]
+fn swap_split_pane_left_command_moves_active_pane_backward() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let (split_id, first_tab_id, second_tab_id, third_tab_id) = create_three_pane_split(&mut core)?;
+    core.select_tab(&second_tab_id)?;
+
+    core.set_command_query(">swap-split-pane-left");
+    let intent = core.submit_command()?;
+    let snapshot = core.snapshot()?;
+    let layout = snapshot
+        .split_layouts
+        .iter()
+        .find(|layout| layout.id() == &split_id)
+        .ok_or("missing split layout")?;
+    let pane_ids = layout.panes().iter().map(|pane| pane.tab_id()).collect::<Vec<_>>();
+
+    assert_eq!(intent, Some(CommandIntent::Command("swap-split-pane-left".to_string())));
+    assert_eq!(snapshot.active_tab_id, second_tab_id);
+    assert_eq!(pane_ids, vec![&second_tab_id, &first_tab_id, &third_tab_id]);
+    assert_eq!(snapshot.command_query, "");
+    Ok(())
+}
+
+#[test]
+fn swap_split_pane_command_preserves_query_without_active_split() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let active_tab_id = core.active_tab()?.id().clone();
+
+    core.set_command_query(">swap-split-pane");
+    let intent = core.submit_command()?;
+    let snapshot = core.snapshot()?;
+
+    assert_eq!(intent, Some(CommandIntent::Command("swap-split-pane".to_string())));
+    assert_eq!(snapshot.active_tab_id, active_tab_id);
+    assert!(snapshot.split_layouts.is_empty());
+    assert_eq!(snapshot.command_query, ">swap-split-pane");
+    Ok(())
+}
+
+#[test]
+fn swap_split_pane_refreshes_saved_split_title() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    core.open_tab(UrlText::parse("https://example.com/docs")?);
+    core.group_active_tab("Research")?;
+    core.open_tab(UrlText::parse("https://servo.org")?);
+    core.group_active_tab("Research")?;
+    let split_id = core.split_active_tab_group()?.ok_or("missing split id")?;
+    core.save_active_split_view()?;
+
+    core.swap_active_split_pane()?;
+    let snapshot = core.snapshot()?;
+    let layout = snapshot
+        .split_layouts
+        .iter()
+        .find(|layout| layout.id() == &split_id)
+        .ok_or("missing saved split layout")?;
+
+    assert!(layout.saved());
+    assert_eq!(layout.title(), "Split View: servo.org + example.com");
+    assert_eq!(layout.pane_count(), 2);
+    Ok(())
+}
+
+fn create_three_pane_split(
+    core: &mut BrowserCore,
+) -> Result<(SplitId, TabId, TabId, TabId), Box<dyn Error>> {
+    let first_tab_id = core.active_tab()?.id().clone();
+    let split_id = core.split_active_tab_right()?;
+    let second_tab_id = core.active_tab()?.id().clone();
+    core.split_active_tab_right()?;
+    let third_tab_id = core.active_tab()?.id().clone();
+
+    Ok((split_id, first_tab_id, second_tab_id, third_tab_id))
+}
diff --git a/crates/ely_domain/src/split.rs b/crates/ely_domain/src/split.rs
index cd5c3bf..2463ef0 100644
--- a/crates/ely_domain/src/split.rs
+++ b/crates/ely_domain/src/split.rs
@@ -109,6 +109,30 @@ impl SplitLayout {
         true
     }
 
+    pub fn swap_tab_with_previous(&mut self, tab_id: &TabId) -> bool {
+        let Some(index) = self.pane_index(tab_id) else {
+            return false;
+        };
+        if index == 0 {
+            return false;
+        }
+
+        self.panes.swap(index - 1, index);
+        true
+    }
+
+    pub fn swap_tab_with_next(&mut self, tab_id: &TabId) -> bool {
+        let Some(index) = self.pane_index(tab_id) else {
+            return false;
+        };
+        if index + 1 >= self.panes.len() {
+            return false;
+        }
+
+        self.panes.swap(index, index + 1);
+        true
+    }
+
     pub fn remove_tab(&mut self, tab_id: &TabId) -> bool {
         let original_len = self.panes.len();
         self.panes.retain(|pane| pane.tab_id() != tab_id);
@@ -119,4 +143,8 @@ impl SplitLayout {
         self.title = title.into();
         self.saved = true;
     }
+
+    fn pane_index(&self, tab_id: &TabId) -> Option<usize> {
+        self.panes.iter().position(|pane| pane.tab_id() == tab_id)
+    }
 }